Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

HO2S

Electronic Engine Controls

The HO2S:

- sends the PCM a signal indicating oxygen content in the exhaust before the exhaust enters the catalytic converter.
- provides feedback information to the PCM used to calculate fuel delivery.

The CMS:

- sends the PCM a signal indicating oxygen content in the exhaust after the exhaust leaves the catalytic converter to calculate catalytic converter integrity.